[R] Restricted 4-PL curves using drc package

li li hannah.hlx at gmail.com
Wed Dec 9 21:27:48 CET 2015

Hi all,
  In drc package, is there a function which can be used to fit restricted
4PL curves? For example, we restrict two 4PL curves have the same lower and
upper asymptotes?
  Thanks for the help in advance!

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